Python numpy 模块，nanvar() 实例源码
我们从Python开源项目中，提取了以下32个代码示例，用于说明如何使用numpy.nanvar()。
def test_ddof_too_big(self):
nanfuncs = [np.nanvar, np.nanstd]
stdfuncs = [np.var, np.std]
dsize = [len(d) for d in _rdat]
for nf, rf in zip(nanfuncs, stdfuncs):
for ddof in range(5):
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always')
tgt = [ddof >= d for d in dsize]
res = nf(_ndat, axis=1, ddof=ddof)
assert_equal(np.isnan(res), tgt)
if any(tgt):
assert_(len(w) == 1)
assert_(issubclass(w[0].category, RuntimeWarning))
else:
assert_(len(w) == 0)
def calculate_feature_statistics(feature_id):
feature = Feature.objects.get(pk=feature_id)
dataframe = _get_dataframe(feature.dataset.id)
feature_col = dataframe[feature.name]
feature.min = np.amin(feature_col).item()
feature.max = np.amax(feature_col).item()
feature.mean = np.mean(feature_col).item()
feature.variance = np.nanvar(feature_col).item()
unique_values = np.unique(feature_col)
integer_check = (np.mod(unique_values, 1) == 0).all()
feature.is_categorical = integer_check and (unique_values.size < 10)
if feature.is_categorical:
feature.categories = list(unique_values)
feature.save(update_fields=['min', 'max', 'variance', 'mean', 'is_categorical', 'categories'])
del unique_values, feature
def test_ddof_too_big(self):
nanfuncs = [np.nanvar, np.nanstd]
stdfuncs = [np.var, np.std]
dsize = [len(d) for d in _rdat]
for nf, rf in zip(nanfuncs, stdfuncs):
for ddof in range(5):
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always')
tgt = [ddof >= d for d in dsize]
res = nf(_ndat, axis=1, ddof=ddof)
assert_equal(np.isnan(res), tgt)
if any(tgt):
assert_(len(w) == 1)
assert_(issubclass(w[0].category, RuntimeWarning))
else:
assert_(len(w) == 0)
def corr(data):
ns = data.shape[0];
nt = data.shape[1];
pairs = make_pairs(ns);
npp = len(pairs);
mean = np.nanmean(data, axis = 0);
var = np.nanvar(data - mean, axis = 0);
c = np.zeros(nt);
for p in pairs:
c += np.nanmean( (data[p[0]] - mean) * (data[p[1]] - mean), axis = 0) / var;
c /= npp;
return c;
def test_ddof_too_big(self):
nanfuncs = [np.nanvar, np.nanstd]
stdfuncs = [np.var, np.std]
dsize = [len(d) for d in _rdat]
for nf, rf in zip(nanfuncs, stdfuncs):
for ddof in range(5):
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always')
tgt = [ddof >= d for d in dsize]
res = nf(_ndat, axis=1, ddof=ddof)
assert_equal(np.isnan(res), tgt)
if any(tgt):
assert_(len(w) == 1)
assert_(issubclass(w[0].category, RuntimeWarning))
else:
assert_(len(w) == 0)
def test_ddof_too_big(self):
nanfuncs = [np.nanvar, np.nanstd]
stdfuncs = [np.var, np.std]
dsize = [len(d) for d in _rdat]
for nf, rf in zip(nanfuncs, stdfuncs):
for ddof in range(5):
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always')
tgt = [ddof >= d for d in dsize]
res = nf(_ndat, axis=1, ddof=ddof)
assert_equal(np.isnan(res), tgt)
if any(tgt):
assert_(len(w) == 1)
assert_(issubclass(w[0].category, RuntimeWarning))
else:
assert_(len(w) == 0)
def test_dtype_from_dtype(self):
mat = np.eye(3)
codes = 'efdgFDG'
for nf, rf in zip(self.nanfuncs, self.stdfuncs):
for c in codes:
with suppress_warnings() as sup:
if nf in {np.nanstd, np.nanvar} and c in 'FDG':
# Giving the warning is a small bug, see gh-8000
sup.filter(np.ComplexWarning)
tgt = rf(mat, dtype=np.dtype(c), axis=1).dtype.type
res = nf(mat, dtype=np.dtype(c), axis=1).dtype.type
assert_(res is tgt)
# scalar case
tgt = rf(mat, dtype=np.dtype(c), axis=None).dtype.type
res = nf(mat, dtype=np.dtype(c), axis=None).dtype.type
assert_(res is tgt)
def test_dtype_from_char(self):
mat = np.eye(3)
codes = 'efdgFDG'
for nf, rf in zip(self.nanfuncs, self.stdfuncs):
for c in codes:
with suppress_warnings() as sup:
if nf in {np.nanstd, np.nanvar} and c in 'FDG':
# Giving the warning is a small bug, see gh-8000
sup.filter(np.ComplexWarning)
tgt = rf(mat, dtype=c, axis=1).dtype.type
res = nf(mat, dtype=c, axis=1).dtype.type
assert_(res is tgt)
# scalar case
tgt = rf(mat, dtype=c, axis=None).dtype.type
res = nf(mat, dtype=c, axis=None).dtype.type
assert_(res is tgt)
def test_ddof_too_big(self):
nanfuncs = [np.nanvar, np.nanstd]
stdfuncs = [np.var, np.std]
dsize = [len(d) for d in _rdat]
for nf, rf in zip(nanfuncs, stdfuncs):
for ddof in range(5):
with suppress_warnings() as sup:
sup.record(RuntimeWarning)
sup.filter(np.ComplexWarning)
tgt = [ddof >= d for d in dsize]
res = nf(_ndat, axis=1, ddof=ddof)
assert_equal(np.isnan(res), tgt)
if any(tgt):
assert_(len(sup.log) == 1)
else:
assert_(len(sup.log) == 0)
def compute(self, today, assets, out, close):
# prepare X matrix (x_is - x_bar)
X = range(self.window_length)
X_bar = np.nanmean(X)
X_vector = X - X_bar
X_matrix = np.tile(X_vector, (len(close.T), 1)).T
# prepare Y matrix (y_is - y_bar)
Y_bar = np.nanmean(close, axis=0)
Y_bars = np.tile(Y_bar, (self.window_length, 1))
Y_matrix = close - Y_bars
# prepare variance of X
X_var = np.nanvar(X)
# multiply X matrix an Y matrix and sum (dot product)
# then divide by variance of X
# this gives the MLE of Beta
out[:] = (np.sum((X_matrix * Y_matrix), axis=0) / X_var) / (self.window_length)
def compute(self, today, assets, out, close):
# prepare X matrix (x_is - x_bar)
X = range(self.window_length)
X_bar = np.nanmean(X)
X_vector = X - X_bar
X_matrix = np.tile(X_vector, (len(close.T), 1)).T
# prepare Y vectors (y_is - y_bar)
Y_bar = np.nanmean(close, axis=0)
Y_bars = np.tile(Y_bar, (self.window_length, 1))
Y_matrix = close - Y_bars
# multiply X matrix an Y matrix and sum (dot product)
# then divide by variance of X
# this gives the MLE of Beta
betas = (np.sum((X_matrix * Y_matrix), axis=0) / X_var) / (self.window_length)
# prepare variance of X
X_var = np.nanvar(X)
# now use to get to MLE of alpha
out[:] = Y_bar - (betas * X_bar)
def test_ddof_too_big(self):
nanfuncs = [np.nanvar, np.nanstd]
stdfuncs = [np.var, np.std]
dsize = [len(d) for d in _rdat]
for nf, rf in zip(nanfuncs, stdfuncs):
for ddof in range(5):
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always')
tgt = [ddof >= d for d in dsize]
res = nf(_ndat, axis=1, ddof=ddof)
assert_equal(np.isnan(res), tgt)
if any(tgt):
assert_(len(w) == 1)
assert_(issubclass(w[0].category, RuntimeWarning))
else:
assert_(len(w) == 0)
def test_nanvar(self):
tgt = np.var(self.mat)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat), tgt)
tgt = np.var(mat, ddof=1)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat, ddof=1), tgt)
def test_ddof(self):
nanfuncs = [np.nanvar, np.nanstd]
stdfuncs = [np.var, np.std]
for nf, rf in zip(nanfuncs, stdfuncs):
for ddof in [0, 1]:
tgt = [rf(d, ddof=ddof) for d in _rdat]
res = nf(_ndat, axis=1, ddof=ddof)
assert_almost_equal(res, tgt)
def mean_var(data):
# TODO: assert is a np.array
mean = np.nanmean(data, axis=0)
var = np.nanvar(data, axis=0)
return [mean, var]
def test_basic_stats(x):
s = SummaryStats()
s.update(x)
assert s.count() == np.count_nonzero(~np.isnan(x))
np.testing.assert_allclose(s.sum(), np.nansum(x), rtol=RTOL, atol=ATOL)
np.testing.assert_equal(s.min(), np.nanmin(x) if len(x) else np.nan)
np.testing.assert_equal(s.max(), np.nanmax(x) if len(x) else np.nan)
np.testing.assert_allclose(s.mean(), np.nanmean(x) if len(x) else np.nan,
rtol=RTOL, atol=ATOL)
np.testing.assert_allclose(s.var(), np.nanvar(x) if len(x) else np.nan,
rtol=RTOL, atol=ATOL)
np.testing.assert_allclose(s.std(), np.nanstd(x) if len(x) else np.nan,
rtol=RTOL, atol=ATOL)
def fit(self, X, y=None):
self.variances_ = np.nanvar(X, 0)
return self
def test_nanvar(self):
tgt = np.var(self.mat)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat), tgt)
tgt = np.var(mat, ddof=1)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat, ddof=1), tgt)
def test_ddof(self):
nanfuncs = [np.nanvar, np.nanstd]
stdfuncs = [np.var, np.std]
for nf, rf in zip(nanfuncs, stdfuncs):
for ddof in [0, 1]:
tgt = [rf(d, ddof=ddof) for d in _rdat]
res = nf(_ndat, axis=1, ddof=ddof)
assert_almost_equal(res, tgt)
def get_stats(arr):
return np.array([
np.nanmean(arr),
np.nanvar(arr),
np.nanmedian(arr),
np.nanstd(arr),
arr.shape[0]
])
def _calc_var(self):
if self.data is None:
raise RuntimeError('Fit the data model first.')
data = self.data.T
# variance calc
var = np.nanvar(data, axis=1)
total_var = var.sum()
self.var_exp = self.eig_vals.cumsum() / total_var
def test_nanvar(self):
tgt = np.var(self.mat)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat), tgt)
tgt = np.var(mat, ddof=1)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat, ddof=1), tgt)
def test_ddof(self):
nanfuncs = [np.nanvar, np.nanstd]
stdfuncs = [np.var, np.std]
for nf, rf in zip(nanfuncs, stdfuncs):
for ddof in [0, 1]:
tgt = [rf(d, ddof=ddof) for d in _rdat]
res = nf(_ndat, axis=1, ddof=ddof)
assert_almost_equal(res, tgt)
def test_nanvar(self):
tgt = np.var(self.mat)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat), tgt)
tgt = np.var(mat, ddof=1)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat, ddof=1), tgt)
def test_ddof(self):
nanfuncs = [np.nanvar, np.nanstd]
stdfuncs = [np.var, np.std]
for nf, rf in zip(nanfuncs, stdfuncs):
for ddof in [0, 1]:
tgt = [rf(d, ddof=ddof) for d in _rdat]
res = nf(_ndat, axis=1, ddof=ddof)
assert_almost_equal(res, tgt)
def var(self):
''' Variance of displacement
:type: float
'''
return num.nanvar(self.displacement)
def test_nanvar(self):
tgt = np.var(self.mat)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat), tgt)
tgt = np.var(mat, ddof=1)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat, ddof=1), tgt)
def test_ddof(self):
nanfuncs = [np.nanvar, np.nanstd]
stdfuncs = [np.var, np.std]
for nf, rf in zip(nanfuncs, stdfuncs):
for ddof in [0, 1]:
tgt = [rf(d, ddof=ddof) for d in _rdat]
res = nf(_ndat, axis=1, ddof=ddof)
assert_almost_equal(res, tgt)
def compute(self, today, assets, out, close):
# get returns dataset
returns = ((close - np.roll(close, 1, axis=0)) / np.roll(close, 1, axis=0))[1:]
# get index of benchmark
benchmark_index = np.where((assets == 8554) == True)[0][0]
# get returns of benchmark
benchmark_returns = returns[:, benchmark_index]
# prepare X matrix (x_is - x_bar)
X = benchmark_returns
X_bar = np.nanmean(X)
X_vector = X - X_bar
X_matrix = np.tile(X_vector, (len(returns.T), 1)).T
# prepare Y matrix (y_is - y_bar)
Y_bar = np.nanmean(close, axis=0)
Y_bars = np.tile(Y_bar, (len(returns), 1))
Y_matrix = returns - Y_bars
# prepare variance of X
X_var = np.nanvar(X)
# multiply X matrix an Y matrix and sum (dot product)
# then divide by variance of X
# this gives the MLE of Beta
out[:] = (np.sum((X_matrix * Y_matrix), axis=0) / X_var) / (len(returns))
def compute(self, today, assets, out, data):
out[:] = np.nanvar(data, axis=0)
def test_nanvar(self):
tgt = np.var(self.mat)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat), tgt)
tgt = np.var(mat, ddof=1)
for mat in self.integer_arrays():
assert_equal(np.nanvar(mat, ddof=1), tgt)